Patents by Inventor Kazui Omokawa

Kazui Omokawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hydrophobic silica powder
    Patent number: 11691885
    Abstract: Provided is a hydrophobic silica powder that can be obtained by the sol-gel process, and that is excellent in charge properties. The hydrophobic silica powder has a hydrophobicity of 50% or more, a saturated water content of 4% or less, and a nitrogen content of 0.05% or more.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: July 4, 2023
    Assignee: FUSO CHEMICAL CO., LTD.
    Inventors: Kazui Omokawa, Hirokazu Yokota, Kenichi Takeuchi, Yuma Negishi, Tomoko Kiseki, Munenori Komoto
  • HYDROPHOBIC SILICA POWDER AND TONER RESIN PARTICLE
    Publication number: 20220128914
    Abstract: The present invention provides a hydrophobic silica powder having a small particle size, a narrow particle size distribution, and a high hydrophobicity, and containing a very small amount of organic acid, and toner resin particles having the hydrophobic silica powder on the surface thereof. A hydrophobic silica powder having a particle size (D50) as measured by a laser diffraction method of 300 nm or less, a particle size distribution index (D90/D10) of 3.0 or less, a hydrophobicity of 60% by volume or more, and an organic acid content of 1 to 300 ppm.
    Type: Application
    Filed: February 26, 2020
    Publication date: April 28, 2022
    Applicant: FUSO CHEMICAL CO., LTD.
    Inventors: Kazui Omokawa, Yuma Negishi, Yasuhiro Fuma
  • HYDROPHOBIC SILICA POWDER
    Publication number: 20210061667
    Abstract: Provided is a hydrophobic silica powder that can be obtained by the sol-gel process, and that is excellent in charge properties. The hydrophobic silica powder has a hydrophobicity of 50% or more, a saturated water content of 4% or less, and a nitrogen content of 0.05% or more.
    Type: Application
    Filed: September 5, 2018
    Publication date: March 4, 2021
    Applicant: FUSO CHEMICAL CO., LTD.
    Inventors: Kazui Omokawa, Hirokazu Yokota, Kenichi Takeuchi, Yuma Negishi, Tomoko Kiseki, Munenori Komoto